hydroboost install - now PS pump whines. - Diesel Forum - TheDieselStop.com
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post #1 of 7 (permalink) Old 10-22-2019, 11:45 AM Thread Starter
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hydroboost install - now PS pump whines.

I recently installed hydroboost on my 1996 F250 Powerstroke. Upon firing it up, the power steering pump whines now. It gets slightly louder if I step on the brake or turn the steering wheel. It never made a peep before the install.
Has anyone experienced this before?

Also, I noticed that the orifice on the new hose going from the hydroboost to the PS pump is slightly smaller than the original hose. I'm wondering if there is less fluid flow now, causing the whining?

I changed the fluid (ATF type F) and didn't really help.
Brakes work well. I didn't connect the pressure sensor yet. Need a "T" as there was not port for the sensor on the new master cylinder.

Thanks in advance.
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'96 F250 4x4 Crew Cab SB
Chipped
Stage 1 Injectors
4" straight pipe
8" lift on 38.5" tires
Rear disc brake conversion
Still in progress...
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post #2 of 7 (permalink) Old 10-22-2019, 12:26 PM
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Totally normal unless this is going on for days. It takes time to completely remove the air from the system. There is a vacuum adapter that can be put on the fluid reservoir that when vacuum is applied is supposed to hasten this process. My experience is that pressing the brake a couple of times and turning the steering wheel lock to lock once then shutting the engine off 10 minutes and repeating several times is a good start. Also you can step up the fluid to synthetic ATF like Mercon LV.


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Last edited by ford_doctor; 10-22-2019 at 12:29 PM.
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post #3 of 7 (permalink) Old 10-22-2019, 12:58 PM Thread Starter
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Yeah, It's been whining for about 6 days now. Maybe I'll try the synthetic ATF. I did all of the air bleeding steps, but no luck yet. It's just annoying. I'd like to understand exactly what is causing it, as there wasn't a whine until I added the hydroboost. I understand a pump will whine when low on fluid, so I thought maybe the hydroboost or the new lines might be restricting the flow, and acting like a low fluid situation.

'96 F250 4x4 Crew Cab SB
Chipped
Stage 1 Injectors
4" straight pipe
8" lift on 38.5" tires
Rear disc brake conversion
Still in progress...
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post #4 of 7 (permalink) Old 10-24-2019, 05:46 AM
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Wait... this was not a repair/replacement of the hydroboost but an upgrade install?


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post #5 of 7 (permalink) Old 10-24-2019, 02:50 PM
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Please give us a little more detail of what you did. Did you replace the hydroboost, or add a second hydroboost, or upgrade the hydroboost?
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2001 F350 XLT 4X4 crew cab, dual rear wheels, long bed, black, 7.3l turbo diesel, automatic transmission, 4.10, shift on the fly, running boards, sliding rear window, 38 gal fuel tank, Odyssey extreme 65-PC1750T batteries, Michelin LTX-MS2 rear tires, Sumitomo Encounter front tires, Shell Rotella Ultra elc, 11,500 gvwr, 20,000 gcwr, 7500 gvw, completely stock, 114,000 miles when purchased, now has 250,000 miles, repairs so far: two starters, batteries, cps, brakes, tires, alternator, ball joints, locking hub, wheel hub, AC compressor, serpentine belt, power steering pump, driver's side window, ignition switch, o-ring, Spectra premium radiator, water pump, fan clutch, fan blades, thermostat, thermostat housing, tensioner. Stolen twice so far, but recovered both times with major damage.

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post #6 of 7 (permalink) Old 10-25-2019, 10:49 AM Thread Starter
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I replaced/upgraded the standard vacuum assist to a new hydroboost and new master cylinder.

'96 F250 4x4 Crew Cab SB
Chipped
Stage 1 Injectors
4" straight pipe
8" lift on 38.5" tires
Rear disc brake conversion
Still in progress...
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post #7 of 7 (permalink) Old 10-28-2019, 11:05 AM Thread Starter
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Correct. Upgrade installation.

'96 F250 4x4 Crew Cab SB
Chipped
Stage 1 Injectors
4" straight pipe
8" lift on 38.5" tires
Rear disc brake conversion
Still in progress...
Dieselfoil is offline  
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